/******************************************************************************************************************************

 * @ Original idea by by Binny V A, Original version: 2.00.A 
 * @ http://www.openjs.com/scripts/events/keyboard_shortcuts/
 * @ Original License : BSD
 
 * @ jQuery Plugin by Tzury Bar Yochay 
        mail: tzury.by@gmail.com
        blog: evalinux.wordpress.com
        face: facebook.com/profile.php?id=513676303
        
        (c) Copyrights 2007
        
 * @ jQuery Plugin version Beta (0.0.2)
 * @ License: jQuery-License.
 
TODO:
    add queue support (as in gmail) e.g. 'x' then 'y', etc.
    add mouse + mouse wheel events.

USAGE:
    $.hotkeys.add('Ctrl+c', function(){ alert('copy anyone?');});
    $.hotkeys.add('Ctrl+c', {target:'div#editor', type:'keyup', propagate: true},function(){ alert('copy anyone?');});>
    $.hotkeys.remove('Ctrl+c'); 
    $.hotkeys.remove('Ctrl+c', {target:'div#editor', type:'keypress'}); 
    
******************************************************************************************************************************/
import jQuery from 'jquery';

let all = {},
    userAgent = navigator.userAgent.toLowerCase(),
    opera = /opera/.test(userAgent),
    safari = /safari/.test(userAgent),
    special_keys = {
        27: 'esc', 
        9: 'tab', 
        32:'space', 
        13: 'return', 
        8: 'backspace', 
        145: 'scroll', 
        20: 'capslock', 
        144: 'numlock', 
        19: 'pause', 
        45: 'insert', 
        36: 'home', 
        46: 'del',
        35: 'end', 
        33: 'pageup', 
        34: 'pagedown', 
        37:'left', 
        38: 'up', 
        39: 'right',
        40: 'down', 
        112: 'f1',
        113: 'f2', 
        114: 'f3', 
        115: 'f4', 
        116: 'f5', 
        117: 'f6', 
        118: 'f7', 
        119: 'f8', 
        120: 'f9', 
        121: 'f10', 
        122: 'f11', 
        123: 'f12'
    },
    shift_nums = { 
        "`":"~", 
        "1":"!", 
        "2":"@", 
        "3":"#", 
        "4":"$", 
        "5":"%", 
        "6":"^", 
        "7":"&", 
        "8":"*", 
        "9":"(", 
        "0":")",
         "-":"_", 
         "=":"+", 
         ";":":", 
         "'":"\"", 
         ",":"<", 
        ".":">",  
        "/":"?",  
        "\\":"|" 
    };

let HotKeys = {
    add: function(combi, options, callback) {
        if (jQuery.isFunction(options)){
            callback = options;
            options = {};
        }
        var opt = {},
            defaults = {type: 'keydown', propagate: false, disableInInput: false, target: jQuery('html')[0], checkParent: true};
        opt = jQuery.extend( opt , defaults, options || {} );
        combi = combi.toLowerCase();        
        
        // inspect if keystroke matches
        var inspector = function(event) {
            event = jQuery.event.fix(event); // jQuery event normalization.
            var element = event.target;
            // @ TextNode -> nodeType == 3
            element = (element.nodeType==3) ? element.parentNode : element;
            
            if(opt['disableInInput']) { // Disable shortcut keys in Input, Textarea fields
                var target = jQuery(element);
                if( target.is("input") || target.is("textarea")){
                    return;
                }
            }
            var code = event.which,
                type = event.type,
                character = String.fromCharCode(code).toLowerCase(),
                special = special_keys[code],
                shift = event.shiftKey,
                ctrl = event.ctrlKey,
                alt= event.altKey,
                propagate = true, // default behaivour
                mapPoint = null;
            
            // in opera + safari, the event.target is unpredictable.
            // for example: 'keydown' might be associated with HtmlBodyElement 
            // or the element where you last clicked with your mouse.
            if (opera || safari || opt.checkParent){
                while (!all[element] && element.parentNode){
                    element = element.parentNode;
                }
            }
            
            var cbMap = all[element].events[type].callbackMap;
            if(!shift && !ctrl && !alt) { // No Modifiers
                mapPoint = cbMap[special] ||  cbMap[character]
            }
            // deals with combinaitons (alt|ctrl|shift+anything)
            else{
                var modif = '';
                if(alt) modif +='alt+';
                if(ctrl) modif+= 'ctrl+';
                if(shift) modif += 'shift+';
                // modifiers + special keys or modifiers + characters or modifiers + shift characters
                mapPoint = cbMap[modif+special] || cbMap[modif+character] || cbMap[modif+shift_nums[character]]
            }
            if (mapPoint){
                mapPoint.cb(event);
                if(!mapPoint.propagate) {
                    event.stopPropagation();
                    event.preventDefault();
                    return false;
                }
            }
        };        
        // first hook for this element
        if (!all[opt.target]){
            all[opt.target] = {events:{}};
        }
        if (!all[opt.target].events[opt.type]){
            all[opt.target].events[opt.type] = {callbackMap: {}}
            jQuery.event.add(opt.target, opt.type, inspector);
        }        
        all[opt.target].events[opt.type].callbackMap[combi] =  {cb: callback, propagate:opt.propagate};
    },
    remove: function(exp, opt) {
        opt = opt || {};
        let target = opt['target'] || jQuery('html')[0];
        let type = opt['type'] || 'keydown';
        exp = exp.toLowerCase();        
        delete all[target].events[type].callbackMap[exp];
    }    
}

export default HotKeys;